package com.bjc.educenter.controller;

import com.bjc.commonutils.JwtUtils;
import com.bjc.educenter.entity.UcenterMember;
import com.bjc.educenter.service.UcenterMemberService;
import com.bjc.educenter.utils.ConstantPropertiesUtil;
import com.bjc.educenter.utils.HttpClientUtils;
import com.bjc.servicebase.exceptionhandler.GuliException;
import com.google.gson.Gson;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.CrossOrigin;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.HashMap;

/**
 * @program: guli_parent
 * @description: 控制层
 * @author: bjc
 * @create: 2020-10-24 23:16
 */
//置视请求地址 不返回数据
@Controller
@RequestMapping(value = "/api/ucenter/wx")
//@CrossOrigin
public class WxApiController {

    @Autowired
    private UcenterMemberService memberService;

    //2.获取扫描人信息，添加数据
    @GetMapping(value = "/callback")
    public String callback(String code,String state){
        try {
            //1.获取code值  临时票据 类似验证码
            //2.拿着code请求微信固定的地址  得到两个值access_token和ipenid
            String baseAccessTokenUrl = "https://api.weixin.qq.com/sns/oauth2/access_token" +
                    "?appid=%s" +
                    "&secret=%s" +
                    "&code=%s" +
                    "&grant_type=authorization_code";
            //拼接三个参数：id 密钥 和code值
            String accessTokenUrl = String.format(baseAccessTokenUrl,
                    ConstantPropertiesUtil.WX_OPEN_APP_ID,
                    ConstantPropertiesUtil.WX_OPEN_APP_SECRET,
                    code);
            //请求这个拼接好的地址，得到返回两个值access_toke和openid
            //使用httpclient发送请求，得到返回结果
            String accessTokenInfo = HttpClientUtils.get(accessTokenUrl);
//            System.out.println("accessTokenInfo:"+accessTokenInfo);
            //从accessToken字符串获取出来两个值 access_token和openid
            //把accessTokenInfo字符串转换map集合，根据map里面key获取对应值
            //使用json转换工具 Gson
            Gson gson = new Gson();
            HashMap mapAccessToken = gson.fromJson(accessTokenInfo, HashMap.class);
            String access_token = (String)mapAccessToken.get("access_token");
            String openid = (String)mapAccessToken.get("openid");

            //把扫扫描人信息添加数据库里面
            //判断段数据表里面是否存在相同微信信息，根据openid判断
            UcenterMember member = memberService.getOpenIdMember(openid);
            if (member==null){
                //3.拿着得到的access_token和openid再去请求微信提供固定的地址，获取到扫描人信息
                String baseUserInfoUrl = "https://api.weixin.qq.com/sns/userinfo" +
                        "?access_token=%s" +
                        "&openid=%s";
                String userInfoUrl = String.format(baseUserInfoUrl, access_token, openid);
                //发送请求
                String userInfo = HttpClientUtils.get(userInfoUrl);
//            System.out.println(userInfo);
                //获取返回userInfo字符串扫描人信息
                HashMap userInfoMap = gson.fromJson(userInfo, HashMap.class);
                //昵称和头像
                String nickname = (String)userInfoMap.get("nickname");
                String headimgurl = (String)userInfoMap.get("headimgurl");
                member = new UcenterMember();
                member.setOpenid(openid);
                member.setNickname(nickname);
                member.setAvatar(headimgurl);
                memberService.save(member);
            }
            //使用jwt根据member对象生成token字符串
            String jwtToken = JwtUtils.getJwtToken(member.getId(), member.getNickname());
            //最后：返回首页面
            return "redirect:http://localhost:3000?token="+jwtToken;
        }catch (Exception e){
            e.printStackTrace();
            throw new GuliException(20001,"登录失败");
        }
    }

    //1.生成微信扫描二维码
    @GetMapping(value = "/login")
    public String getWxCode(){
        //1.微信开放平台授权baseUrl %s相当于占位符
        String baseUrl = "https://open.weixin.qq.com/connect/qrconnect" +
                "?appid=%s" +
                "&redirect_uri=%s" +
                "&response_type=code" +
                "&scope=snsapi_login" +
                "&state=%s" +
                "#wechat_redirect";
        //需要对redirect_uri进行urlEncode编码
        String redirectUrl = ConstantPropertiesUtil.WX_OPEN_REDIRECT_URL;
        try {
            redirectUrl = URLEncoder.encode(redirectUrl,"utf-8");
        }catch (Exception e) {
            e.printStackTrace();
        }
        //往%s里面赋值
        String url = String.format(baseUrl, ConstantPropertiesUtil.WX_OPEN_APP_ID,redirectUrl,"atguigu");
        //重定向到请求微信地址里面
        return "redirect:"+url;
    }
}
